package com.design.structure.facade.atguigu;

/**
 * @ProjectName: design
 * @Package: com.design.structure.facade.atguigu
 * @ClassName: Screen
 * @Author: shenaiguo
 * @Description: 屏幕
 * @Date: 2020/9/8 0008 22:58
 */
// 步骤 4
public class Screen {

    private static Screen instance = new Screen();


    public static Screen getInstance() {
        return instance;
    }


    public void up() {
        System.out.println(" Screen up ");
    }

    public void down() {
        System.out.println(" Screen down ");
    }
}
